The origin and meaning of idioms, or expressions, are discussed.
|It's idiomatic, biatch.|
A husband could beat his wife so long as he didn't use a stick larger than his thumb
There's never been such a law in English or American law, it actually refers to early non-standard measurements. For example a foot would be the length of an adult male's foot, a yard would often be the length of his arm, and so forth. It's where we get all of the goofy measurements like foot, hands, and so forth from.